Yes and yes! Email is in the works and should be ready within 1-2 months. First goal is to get it working well and out of beta on the RPi, then after that it will be ported to other architectures.
Please please please offer a secure (i.e. up to date and also TLS-preferring), pre-set-up email server with ArkOS, complete with instructions on how to create MX, SPF and DKIM records for one's domain. You will do everyone who's interested in privacy a great service and deal a blow to the mass surveillance agencies.
Also, will it be ported to other, more powerful hardware?